<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数"
        type="warning"
        :closable="false"
        show-icon
      >
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- Tabs页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加动态参数按钮 -->
          <el-button
            type="primary"
            plain
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <el-table-column type="expand" label="展开">
              <template slot-scope="scope">
                <!-- 循环渲染tag -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClosed(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加tag按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <el-table-column type="index" label="索引"></el-table-column>
            <el-table-column
              prop="attr_name"
              label="参数名称"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  class="el-icon-edit"
                  type="primary"
                  plain
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  class="el-icon-delete"
                  type="danger"
                  plain
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加静态属性按钮 -->
          <el-button
            type="primary"
            plain
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <el-table-column type="expand" label="展开">
              <template slot-scope="scope">
                <!-- 循环渲染tag -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClosed(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加tag按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <el-table-column type="index" label="索引"></el-table-column>
            <el-table-column
              prop="attr_name"
              label="属性名称"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  class="el-icon-edit"
                  type="primary"
                  plain
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  class="el-icon-delete"
                  type="danger"
                  plain
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加参数对话框 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="90px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 添加参数对话框 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="90px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'Params',
  data() {
    return {
      //商品分类列表
      cateList: [],
      //级联选择框的配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
      },
      //级联选择框双向绑定到的数组
      selectedCateKeys: [],
      //被激活页签名称
      activeName: 'many',
      //动态数据列表
      manyTableData: [],
      //静态数据列表
      onlyTableData: [],

      //添加对话框的显示与隐藏
      addDialogVisible: false,

      //添加参数表单数据对下
      addForm: {
        attr_name: '',
      },
      //验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' },
        ],
      },

      //修改对话框的显示与隐藏
      editDialogVisible: false,
      //修改的表单数据对象
      editForm: {},
      //修改的表单数据对象验证规则
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' },
        ],
      },
    }
  },
  computed: {
    //如果按钮需要被禁用，则返回true否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    //当前选中的三级分类的ID
    cateID() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    //动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    },
  },
  created() {
    this.getCateList()
  },
  methods: {
    //获取所有商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      this.cateList = res.data
    },
    //级联选择框监听函数
    handleChange() {
      this.getParamsData()
    },
    //Tabs页签选择事件
    handleTabClick() {
      this.getParamsData()
    },
    //获取参数列表数据
    async getParamsData() {
      //证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      //更具分类ID和所处的面板获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateID}/attributes`,
        {
          params: {
            sel: this.activeName,
          },
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        //控制文本框的显示与隐藏
        item.inputVisible = false
        //文本框中输入的值
        item.inputValue = ''
      })

      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    //关闭对话框的监听
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    //确认提交参数
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          `categories/${this.cateID}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
          }
        )
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.getParamsData()
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
      })
    },
    //修改参数
    async showEditDialog(attr_id) {
      // 查询当前参数的信息
      const { data: res } = await this.$http.get(
        `categories/${this.cateID}/attributes/${attr_id}`,
        {
          params: {
            attr_sel: this.activeName,
          },
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败！')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    //重置修改的表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    //点击按钮确认修改
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.put(
          `categories/${this.cateID}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName,
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数信息失败！')
        }
        this.getParamsData()
        this.$message.success('修改参数信息成功！')
        this.editDialogVisible = false
      })
    },
    //点击删除参数信息
    async removeParams(attr_id) {
      //弹框提示用户是否要删除
      const confirmResult = await this.$confirm(
        '此操作将永久删除该用户, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning',
        }
      ).catch((error) => {
        return error
      })
      //如果用户确认删除返回值为字符串 confirm,用户取消则返回字符串 cancel
      if (confirmResult !== 'confirm') {
        return this.$message.info('已经取消删除')
      }
      const { data: res } = await this.$http.delete(
        `categories/${this.cateID}/attributes/${attr_id}`
      )
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败！')
      }
      this.getParamsData()
      this.$message.success('删除参数成功！')
    },
    //文本框失去焦点或者enter触发
    async handleInputConfirm(row) {
      console.log('row',row)
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      //若果没有return则后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      //发起请求保存到数据库
      this.saveAttrVals(row)
    },
    //将attr_vals操作保存到数据库
    async saveAttrVals(row) {
      //发起请求保存到数据库
      console.log('attr_id',row.attr_id)
      const { data: res } = await this.$http.put(
        `categories/${this.cateID}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' '), //使用空格做拼接
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败！')
      }
      this.$message.success('修改参数项成功！')
    },
    //点击按钮展示输入框
    showInput(row) {
      row.inputVisible = true
      //让文本框自动获得焦点
      this.$nextTick(() => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    //删除对应参数以及选项
    handleClosed(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    },
  },
}
</script>

<style scoped>
.cat_opt {
  margin: 20px 0;
}
.el-cascader {
  width: 300px;
  margin-left: 10px;
  margin-bottom: -10px;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 100px !important;
  margin-left: 10px !important;
}
.button-new-tag {
  margin-left: 10px !important;
}
</style>